Running back Darren McFadden was conspicuous by his absence Wednesday during the media window as the Raiders began preparations to face the San Diego Chargers.

McFadden who departed in the second quarter of a 24-14 loss to Washington with a hamstring strain was neither on the field nor working with the athletic training staff.

Given McFadden's injury history the Raiders could be considering sitting McFadden against San Diego Sunday night and Kansas City on Oct. 13 with the bye week coming in Week 7. That would give McFadden until Oct. 27 against Pittsburgh to return.

Fullback Marcel Reece who had a negative MRI on a knee strain was on the field and going through drills with teammates as was quarterback Terrelle Pryor who was working with the first team.

For the purposes of practice drills undrafted rookie free agent Matt McGloin was getting more work than Matt Flynn who started against Washington.

Raiders coach Dennis Allen said Monday Pryor would not play until he was free of concussion symptoms.

Also not practicing was center Stefen Wisniewski who was watching practice with his right knee wrapped. During line drills Andre Gurode remained at left guard with Lamar Mady taking reps at center.